Most people don't have careers, instead they have jobs. And the definition of job is "something you're paid to do because you wouldn't do it otherwise".

Note that these prices are for offensive uses of the exploit. Zerodium -- and others -- sell exploits to companies who make surveillance tools and cyber-weapons for governments. Many companies have bug bounty programs for those who want the exploit used for defensive purposes -- i.e., fixed -- but they pay orders of magnitude less. This is a problem.